Date: Sun, 1 Oct 2017 20:31:58 -0600 From: The Doctor <doctor@doctor.nl2k.ab.ca> To: Polytropon <freebsd@edvax.de> Cc: freebsd-questions@freebsd.org Subject: Re: Weird turnoff Message-ID: <20171002023157.GA1163@doctor.nl2k.ab.ca> In-Reply-To: <20171002041047.31f81a0d.freebsd@edvax.de> References: <20171001232531.GA18260@doctor.nl2k.ab.ca> <20171002021140.931f17de.freebsd@edvax.de> <20171002002506.GA42212@doctor.nl2k.ab.ca> <20171002041047.31f81a0d.freebsd@edvax.de>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Oct 02, 2017 at 04:10:47AM +0200, Polytropon wrote: > On Sun, 1 Oct 2017 18:25:06 -0600, The Doctor wrote: > > On Mon, Oct 02, 2017 at 02:11:40AM +0200, Polytropon wrote: > > > On Sun, 1 Oct 2017 17:25:31 -0600, The Doctor wrote: > > > > Could be an attack. > > > > > > > > All right. > > > > > > > > As of this morning (3 p.m. UTC) my seconday FreeBSD 11.1 server > > > > has been going intreface down then up and then unable to route. > > > > > > > > Rebooted this system 2 times today. > > > > > > > > > > > > What should I bee looking for? > > > > > > Primarily the system's log files in /var/log: messages, auth.log, > > > security. Also check the output of the periodic scripts (mailed > > > to root or another user), do they contain hints to something that > > > looks suspicious (SUID changes, system file modifications, etc.)? > > > > > > > exactly what I am looking for > > Many system actions are recorded in those log files. Of course > if an attacker has write access to them, it's fairly easy for > him to delete the entries which suggest that he has been there... > > > > > I am going to have to do a transcribe as I am opreating from the > > potential victim and ssh'ing to this terminal > > > > or ftp the information over > > Use FTP only within a trusted network (which implies only trusted > participants), as information is typically transmitted without > encryption! > > > > > > Oct 1 16:56:46 gallifrey kernel: igb0: link state changed to DOWN > > Oct 1 17:00:10 gallifrey kernel: igb0: link state changed to UP > > Oct 1 17:17:32 gallifrey kernel: igb0: <Intel(R) PRO/1000 Network Connection, Version - 2.5.3-k> port 0x6020-0x603f mem 0xc7120000-0xc713ffff,0xc7144000-0xc7147fff irq 26 at device 0.0 numa-domain 0 on pci3 > > This looks like some reboot. The last message above usually is > the _first_ message with igb0 originator, the following ones > (the ones _above_ it!) must be from a previous run of the system. > A link change cannot be reported before the device hasn't been > initialized by the kernel. > > >From your log, we can easily see the NIC init messages with > the following timestamps (summarized): > > Oct 1 17:17:32 gallifrey kernel: igb0 > Oct 1 17:17:32 gallifrey kernel: igb1 > > Oct 1 17:40:09 gallifrey kernel: igb0 > Oct 1 17:40:09 gallifrey kernel: igb1 > > Oct 1 12:04:48 gallifrey kernel: igb0 > Oct 1 12:04:48 gallifrey kernel: igb1 > > This looks like reboots. Does /var/log/messages have multiple > occurances of the FreeBSD "kernel banner" (the copyright > information and so on)? > > Just me resetting the system > > > Nothing in the auth.log that I can see as an issue. > > That matches the reboot theory. A manual reboot (issued by a system > operator) would cause an entry, but an accidental reboot would not. > > > > > Also, how do I turn routing / ifconfig back on? > > You can use "service netif restart" to restart the networking > subsystem. > That speeds the process up > > > > Rebooting is not that fun > > Agreed, and it doesn't fix the problem either... :-) > > Back to square 1 - where to look for what shut the if down to start with . Also what sort of test can the server do to find that it cannot find he internet so that it can self restart ? Say if ping 8.8.8.8 reurns error implement service netif restart ? > > > -- > Polytropon > Magdeburg, Germany > Happy FreeBSD user since 4.0 > Andra moi ennepe, Mousa, ... > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" -- Member - Liberal International This is doctor@@nl2k.ab.ca Ici doctor@@nl2k.ab.ca Yahweh, Queen & country!Never Satan President Republic!Beware AntiChrist rising! https://www.empire.kred/ROOTNK?t=94a1f39b Look at Psalms 14 and 53 on Atheism Talk Sense to a fool and he calls you foolish - Euripides
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20171002023157.GA1163>